3,4'-ODA (3,4'-oxydianiline, also known as 3,4'-diaminodiphenyl ether or 3-(4-aminophenoxy)aniline) is an asymmetric aromatic diamine used to build polyimide and copolyaramid chains. Unlike its symmetric isomer 4,4'-ODA, its two amino groups occupy different positions relative to the central ether linkage — one meta, one para. That single structural difference changes chain geometry, and it gives formulators a practical lever for balancing processability, chain packing and thermal performance in high-performance polymers.
JLON supplies 3,4'-ODA in ≥99.0% and ≥99.5% purity grades, with batch-to-batch consistency and full documentation (CoA, TDS, SDS) available on request. Quote your CAS 2657-87-6 requirement to receive specifications, samples and pricing.
| Property | Information |
|---|---|
| Product name | 3,4′-Oxydianiline |
| Alternative name | 3,4′-Diaminodiphenyl Ether |
| Abbreviation | 3,4′-ODA |
| CAS number | 2657-87-6 |
| EC number | 220-190-0 |
| Molecular formula | C12H12N2O |
| Molecular weight | 200.24 g/mol |
| Chemical category | Asymmetric aromatic diamine |
| Appearance | Brown to off-white powder, depending on grade |
| Available purity grades | ≥99.0% and ≥99.5% |
The selected grade, analytical method and additional quality limits are confirmed in the quotation.
3,4'-ODA consists of two benzene rings connected through an ether oxygen. On one ring the amino group sits para to the ether linkage; on the other it sits meta. This asymmetry has two practical consequences for polymer design:
• Chain geometry. A para–para diamine such as 4,4'-ODA produces highly regular, rod-like chains that pack efficiently. The meta linkage in 3,4'-ODA introduces a bend into the repeating unit, disrupting regular packing. In practice this tends to increase solubility, support melt-processable and thermoplastic polyimide systems, and shift the balance between glass-transition temperature, coefficient of thermal expansion and mechanical properties.
• Non-equivalent amino groups. Because one amino group is para to the ether oxygen and the other is meta, the two –NH2 groups differ in electronic environment. This can influence relative reactivity during early poly(amic acid) formation and the sequence distribution in copolymers — a detail that matters when reproducibility across batches is critical.
The final polymer properties always depend on the complete formulation: the dianhydride partner (e.g. PMDA, BPDA, ODPA), molecular weight, end groups and the processing route. Monomer choice is one lever among several.
3,4′-ODA is used as a comonomer in ether-containing copolyaramid fibers. These fibers are used in industrial ropes, reinforced hoses, timing belts, protective textiles and composite reinforcement, where strength, flexibility and fatigue resistance are important.
3,4′-ODA is used in polyimide fiber synthesis, including melt-processable polyimide formulations. It provides a diamine building block for manufacturers developing fibers with a balance of heat resistance, mechanical properties and processability.
| Parameter | 3,4′-ODA | 4,4′-ODA |
|---|---|---|
| CAS number | 2657-87-6 | 101-80-4 |
| Amino-group positions relative to the ether linkage | Meta/para | Para/para |
| Structural arrangement | Asymmetric | Symmetric |
These are different chemical substances. They should not be treated as interchangeable without formulation evaluation.
Please include CAS 2657-87-6 in your inquiry to identify the required product accurately.
Key purchasing considerations may include:
Purity and analytical method
Isomer composition
Amine assay or equivalent information
Water content
Residual solvents and organic impurities
Color and solution clarity
Metal or ionic impurities where relevant
Polymerization consistency across batches
A higher purity percentage does not automatically establish suitability for every application. Individual impurity limits and process validation may be equally important.
Keep the material tightly sealed and follow the Safety Data Sheet for the supplied grade. Confirm the recommended storage conditions, shelf life and handling precautions before use.
If color stability or solution quality is critical to your process, include these requirements in the purchasing specification.
3,4′-ODA is an aromatic diamine used in polyimide synthesis, including the development of thermoplastic resins, films, coatings, adhesives, composite matrices and research membrane materials.
JLON offers ≥99.0% and ≥99.5% purity grades. Pricing depends on the selected specification, quantity and delivery requirements.
No. They have different substitution patterns and CAS numbers. The CAS number for 3,4′-ODA is 2657-87-6.
No. Melt processability depends on the complete polymer structure, molecular weight and processing conditions.
Suitability must be established through formulation testing and agreed impurity limits. Monomer purity alone does not guarantee optical transparency, dielectric performance or electronic-grade qualification.
Please provide:
Required purity grade
Intended polymer or application
Analytical and impurity requirements
Trial quantity and estimated annual demand
Packaging requirements
Delivery destination and required delivery date
Contact JLON to discuss 3,4′-ODA specifications, sample requirements and pricing.
